Essentials of Interaction Diagrams

Question 1

UML Interaction Diagram Examples

Answer 1

Sequence Diagrams
Collaboration Diagrams

Question 2

UML Interaction Diagrams

Answer 2

Allow us to record how objects interact to perform a task at hand.

Question 3

Collaborations

Answer 3

The objects which interact to perform some task, showing objects, links and actors.

Question 4

Sequence Diagrams

Answer 4

Represents objects and actors which take part in a collaboration.
Essentially shows a sequence of actions.

Question 5

Sub-collaborations

Answer 5

Subset of the object, together with the links connecting those objects.

Question 6

Dynamic Representations

Answer 6

Collaboration -> {new} and {destroyed} objects
Sequence -> represented partway down the page.

Question 7

Sequence v Collaboration

Answer 7

Sequence diagrams allow passage of time.

Question 8

Activity Diagrams

Answer 8

Describe how activities are coordinated (like how an operation could be implemented).
Can record activities that happen in parallel or sequentially.
Another name for them can be state diagrams.

Question 9

Activity Diagram Features

Answer 9

Activity -> record like the notation for a state
Activity edge -> an arrow which indicates where to move in the diagram after an activity finishes.
Synchro bar -> thick horizontal bar describing the coordination of activities which all must be complemented before moving on.
Decision diamond -> show decisions
Stop/start markers -> used in same way as state diagram (initial/final states)